OLED Display Panel Connection Layer Layout Against Moisture Intrusion
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Solution Overview
Problem
Water vapor entering the light-emitting function layer of OLED display panels can cause malfunction and result in poor display performance, such as growing dark spots, due to the signal connection layer's proximity to the display area.
Innovation Solution
A display panel design with a connection layer positioned to minimize the distance between the signal connection layer and the display area, ensuring a minimum distance of 150 to 250 microns, and incorporating a planarization layer with openings to reduce gas release and crack formation, thereby preventing water vapor from reaching the sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connection layer is positioned closer to the display area to reduce capacitance and improve signal output stability, then the display effect is improved, but water vapor can more easily reach the light-emitting function layer causing dark spots and malfunction
Solution Approach 1:
A planarization layer is introduced as an intermediary component between the connection layer and the display area. This planarization layer acts as a protective barrier that prevents water vapor from reaching the light-emitting function layer while allowing the connection layer to maintain its optimized position for electrical performance. The planarization layer effectively mediates between the conflicting requirements of signal stability and moisture protection.
2Reliability
If the connection layer is positioned closer to the display area, then capacitance is reduced and signal output is stabilized, but the risk of cracks and fractures in the connection layer increases
Solution Approach 1:
The planarization layer serves as a cushioning protective layer positioned before the connection layer. This layer provides mechanical support and stress distribution that prevents cracks and fractures from developing in the connection layer, even when the connection layer is positioned closer to the display area for optimized electrical performance. The cushioning effect is established in advance before any damage can occur.
3Reliability
If the connection layer is positioned closer to the display area, then the display effect is improved through reduced capacitance, but gas release and crack formation increase
Solution Approach 1:
The planarization layer acts as an intermediary protective barrier that isolates the connection layer from the display area environment. This mediation prevents gas release and crack formation in the connection layer while allowing the optimized positioning for reduced capacitance. The planarization layer effectively shields the connection layer from harmful environmental factors.
Data Source
AI summary
Provided are a display panel and a display device. The display panel includes: a base substrate including a display area and a peripheral area; a plurality of sub-pixels; a driving circuit; a power line; a connection layer electrically connected to the power line and located on one side of the driving circuit and the power line away from the base substrate, an orthographic projection of the connection layer on the base substrate partially overlaps with that of the driving circuit on the base substrate, and a minimum distance between an edge of the orthographic projection of the connection layer on the base substrate close to the display area and an edge of an orthographic projection of an anode, which is closest to an edge of the display area of a plurality of anodes of the sub-pixels, on the base substrate ranges from 150 to 250 microns; and a cathode.